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OSSF DR TEST PRACTICE. Questions & answers
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OSSF DR TEST PRACTICE_______ and ________ soil textural classes are always unsuitable for standard
absorptive OSSF - ANS-class IA and IV
List each of the major soil horizons - ANS-surface soil A, surface soil B, and parent
material
_____________ is a term describing the ability of water to migrate through a soil profile
under either _________ or __________ conditions. - ANS-Hydraulic conductivity,
saturated, unsaturated
Interconnected pores in the soil profile allow ______ and _______ to enter the soil at its
surface and migrate downward - ANS-air, water
List the four components of soil - ANS-air, water, organics, inorganics
A drainfield is 50 feet by 90 feet and must be covered with an average of 15 inches of
sand loam. How many cubic yards of sandy loam soil must be purchased (find the
volume of a rectangular object)? - ANS-208.3 cubic yards
What would be the volume of a 5-foot-diameter pump tank that is 5 feet tall with the inlet
1 foot below the rim? - ANS-587 gals
What would be the percent slope on a lot 250 feet deep that drops 20 feet in elevation
over the depth of the lot? - ANS-8%
How many cubic yards of gravel would be needed to fill a ditch 3 feet deep, 10 feet
wide, and 12 feet long with 18 inches of gravel? 1 cubic yard = 27 cubic feet. -
ANS-6.67 cubic yards
A septic tank is 6 feet in diameter and is 8 feet deep. How many gallons will it hold if the
overflow line is located half way up from the bottom? - ANS-846 gals
Calculate the working liquid capacity (volume) for this septic tank. SEE PAGE 2-39!! -
ANS-1077gals
What is the surface area (area in square feet) of an evapotranspiration system 40 feet
wide and 65 feet long? - ANS-2,600 sqft
, Figure the acreage for a piece of property that measures 256 feet on each of four sides.
- ANS-1.5 acres
Figure the area of a lot that measures 60ft by 280ft - ANS-16,800sqft ,0.39 acres
A disposal option that might be considered in a clay soil would be a ________. -
ANS-drip or spray irrigation
The primary treatment device providing the least or poorest treatment of domestic
wastewater would be _______. - ANS-septic tank
Nitrogen or nitrate removal in soil occurs by _________. - ANS-vegetation uptake
The factors influencing the survival of bacteria in soil are _______. - ANS-moisture,
temperature, pH, and organic matter.
Physical removal of bacteria by straining occurs when _______. - ANS-the bacteria are
larger than the pore openings in the soil
A solid that can be filtered out of the wastewater is a _________. - ANS-suspended
solid
Which of the following describes domestic wastewater as it leaves a home? -
ANS-fresh, light in color, has dissolved oxygen
Which of the following are problems caused by malfunctioning septic tank systems? -
ANS-surface water pollution, groundwater contamination, and standing sewage in
neighborhoods
An inorganic chemical that affects human health is - ANS-nitrate
Parasites (helminths) found in untreated sewage include ________. - ANS-hookworm,
round worms, and tapeworms
Viruses are responsible for such diseases as - ANS-poliomyelitis and infectious
hepatitis
A type of bacteria that indicates sewage contamination is ________. - ANS-fecal
coliform
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